Fatal error: Uncaught Error: Class "TYPO3\CMS\Seo\XmlSitemap\AbstractXmlSitemapDataProvider" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-seo/Classes/XmlSitemap/PagesXmlSitemapDataProvider.php:33 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-seo/Classes/XmlSitemap/PagesXmlSitemapDataProvider.php on line 33